Loop antenna



Patented Sept. 13, 1927.

; EDWARD vnooM, or ossrnme, new Yonx',fessienonfre e eeee nrinc'rnicjoo lrg reng-inconronernnjor nnwyonn nfr, nconronnrron'or,Nnwxonx.

This invention relates tolooplantennaei vide a. loo antenna wherein symmetry of the physical parts is secured. ,7

Another objectisto provide a loop antennawhich .may be completely wound before its assembly with the basestructure;

, Afeatureof theinvention relates to an improved portable, rotatable .loop antenna,

whereby the conductors of theloopare held equal spacing, relation in tens onh The :antenna of thisinvention comprises a light frame structure which isformed by. the in terse'c On. of a plurality of polygons so arranged with respect to one another that each side .of'rac'h polygon intersect-s, two. sides of every other polygon. :Upon this structure is wound the antenna'loop which consists of a plurality of equally spaced turns Qof a continuous conductor wound. .in solenoidal form. Attached to the intersecting polygons attheir apicesare'flat blocks of insulating material, preferably micarta, which project equal distances beyond the apices. These plates are provided for spacing and supporting the antenna conductors. Reference may now be had for a more comprehensive idea of the nature of the invention to the accompanying drawings in which Fig. 1 is a front view of the assembled antenna showing the preferred form of this invention.

Fig. 2 is a perspective, portional view showing the antenna after it has been wound and before attachment to the rotatable pivot.

Fig. 3 is an apex of one of the polygons illustrating the spacing of the insulated block attached thereto.

Fig. 4 isa side view of the lower apex of one of the polygons after attachment to the rotating pivot.

In Fig. 5 is illustrated the double notched joint between the intersecting sidesof the polygons.

Referring particularly to Fig. 1, continuous conducting strands 1 of any suitable wire are wound in equally spaced turns upon a frame 2. This frame comprises two intersecting polygonspreferably triangles 3 and 4, the arms thereof being of some insulating material such as beech or maple wood. The

arms of. these triangles may bejoined atgthe vertices. in an suitablemanner...; =W l be noted thateac arm ,of'each triangle intersects two arms, of. the othentriangle and at-eaeh intersection a doublenotched joint (Sis, formed betweenthe two arms. -Since the arms inter sect at an oblique angle it is'necessary to proa, ,beveled'; notch joint such as shown in detail T111. Fig. 5:. The armais provided with a notch 7 havinga depth; equal to one-half ,the breadth of the arm and the notch being beveled 'inisuch awaythat Wh n thetwio arms are, "joined the; angle; formed :thereby will give the complete structure asymmetria ppcarance At each apex is mounted a bloclcof insulating I nate 1" ia;l 13 h aving ,grooves 24 in. itsout'er edgeforathe passage of conductors 1. This ;block;is arranged sy mmetricallywith respect; to, arm 21fand of much greater, length than the width, of 1 arm' 21 so that there willibe considerable overhang, issecured to thearm21 atits center by means 10f screws 23 in-,such away that it projects slightlyb'eyondthe end of the arm al atat-h condu t rs ofyl op which; a e spa ed at qualad tances from Fi 1 eth r. by: E QVQSL t. 7 n in" c n c with any part of the frame structure. This structure may be arranged for mounting on a. rotatable base by providing an insulating block 8 extending from the mid point of the lower arm of triangle 3 to the lower apex of triangle 4. This block may be secured to the lower arm of triangle 3 by a wood screw 9. The joint made between block 8 and the lower apex of triangle 4 may be better understood by referring to Fig. 2.

The arms 10 and 11 of triangle 4 are provided with beveled ends which are firmly secured to opposite sides of block 8 by any suitable fastening means such as nails 12. In the lower portion of block 8 is contained a groove wide enough to admit the insertion of insulating block 13. The depth of this groove is large enough to permit block 13 to extend a short distance beyond the lower end of block 8. Screws 14 are provided for securing blocks 8 and 13 together. A pivot 15 has its upper portion of the same cross section as block 8 and its lower portion circular in .cross sectionto permit rotation when inserted in the round hole of base 16. It is noted that on the two opposite sides of the upper portion are fork shaped metal members 17. The

prongs 18 of each of these members are so spaced as to permit block 13 to fit snugly between them. The metal prongs 18 contam round holes 19 located at a distance from the upper edge of-block l5 that when they coincide with screw holes 20 there 1s ample space between the lower edge of block 13 and the upper edge of block 15 to prevent the conductors of loop 1 from touching block 15. V

' The lower portion of block 15 being circular in form is loosely inserted into a circularhole in any suitable base 16 so that the whole structure may rotate freely.

-A' loop antenna suchas is above described may be successfully employed wherever loop "antennaeare desiredg the principles of this invention have been illustrated and described in connection with certain specific structures, it it not intended that the present disclosure is to be limited thereby but only in as far as pointedout in the following claims.

'Wliat is claimed is:

1. A loop antenna, comprising a frame having a number of supporting arms arranged to form two similar polygons, each polygon comprising an equal number of arms joined together to form a closed figure, the polygons being so arranged that each arm of each polygon intersects and is secured to at least two arms of the other polygons, and a numberof turns of an electrical conductor wound thereon.

2. A loop antenna, comprising a frame having arms arranged to form two tria les, each triangle being formed by joining t ree arms together to form a closed figure, the said triangles being superimposed to form a six pointed figure in which each arm of one triangle intersects and is secured to two arms of the other triangle, and a num ber of turns of an electrical conductor wound thereon;

3. A loop antenna consisting of a number of turns of an electrical conductor wound upon a frame, said frame comprising supporting arms arranged to form two s1milar triangles superimposed to constitute a symmetrical six pointed figure, each arm of said frame being substantially tri-sected by and secured to two other arms,

4. A loop antenna including a loop conductor and a frame for supporting theturns of the loop, said frame comprising arms arranged to form t'wo similar triangles, said triangles being overlapped "to constitute a six pointed symmetrical figure, each arm of each of said triangles intersecting and being secured by interlocking connections to two arms of the other triangle.

5; A' loop antenna includin conductor, a frame upon whic the turns of the conductor are wound, said frame comprising a number of arms joined together to form two triangles su erimposed so as to constitute a symmetrica six pointed fig ure, a base having a rotatable element and means for connecting said rotatable element to said frame at one of said points.

In witness whereof, I hereunto subscribe my name this 26 day of May A. D.,

EDWARD VROOM.

an electrical 

